Walking on the way to the library, Photon recalls the previous scene.

There is only one sentence that Kaihara entrusted to be conveyed by Mr. Kiribana.

"If you have time, please come to the library after school."

It's incredible. It seems that since the day of the transfer, I have been unknowingly having various contacts with Kaihara-san. If this is a complete coincidence, even she herself is a little unconvinced.

Speaking of which, I learned from talking to Mr. Kirimada before that it turned out that Mr. Kaihara was unexpectedly a big man among the students of Tokiwadai.

It was information that I got unexpectedly when I was asked by Madara why I wanted to form my own faction.

Why do you want to form your own faction? In my heart, this question is not very easy to answer. The deepest reason is that I want to identify with my friends. But this reason was obviously embarrassed to say, so she replied:

"Because I want to be better. It would be easier to do this if someone helped. By the way, at least I don't want to be worse than Kaihara-san. ”

Although it is not the most crucial reason, it is certainly not a lie.

However, when she said this reason, the strange eyes of the classmate Che Madara made her remember it vividly.

"It's good to have ideals, and I can't say anything more. But personally, I think it's better to take it one step at a time. ”

At that time, this was what Mr. Che Ban said. When he asked about it, he asked himself a question directly.

"I'm a transfer student, but you've probably heard about the gymnasium accident two months ago, right?"

It was a personal injury accident caused by RSPK syndrome of an able person, but the specific details were not disclosed to the public because the parties and victims were all minors, so Mitsuko did not know the details after marriage.

"I was the victim of that accident. No, one of the victims, to be precise. At that time, with the addition of the discipline inspectors who failed to rescue, there were 52 victims. There are 13 LV.4s among them, and of course I am one of them. ”

This number really scared the marriage. That's a quarter of Tokiwadai's ability, and what a terrible accident it must have been to be able to cause such a wide range of high-level abilities to be killed.

And then, Che Ban told a surprising fact.

"Although there are many rumors outside, I can tell you unequivocally that there is actually only one person who has the ability to cause this accident. In other words, all of us combined, we all lost to one person. ”

And the name of the person reported by the classmate Cheban is simply hard to believe after marriage.

The roommate she had met before, Kaihara-san's roommate, Hoshikawa didn't.

She is self-aware, and if she wants to fight against 13 LV.4 and 39 LV.3, she is afraid that she will lose in an instant. However, according to Kiriban-san, Hoshikawa-san actually defeated 13 LV.4 and 39 LV.3!

After marriage, Mitsuko really couldn't believe that the girl who even looked a little cowardly was such a powerful person.

"It's true. Tokiwadai doesn't have the ability to rank, but if there is, Hoshikawa should be in fourth place. This is not what I said, but we all of us at Tokiwadai agree that this is not what I said. ”

Her words made Photon suddenly aware of the marriage.

Tokiwadai's two LV.5s would naturally be in the top two, and if Hoshikawa-san, who caused that incredible accident, was fourth, wouldn't that mean ......

"That's right, there is a third place. In that accident, it was she who stopped Hoshikawa's ability from going berserk. Therefore, she is recognized as the No.3 of Tokiwadai. I'm sure you've already guessed who it is, right? ”

Indeed, having said that, after marriage, Photon has naturally guessed it. The classmate who is second only to the two LV.5 is the one she has been in contact with in the past two days, and it can even be said that she is the most familiar with in Tokiwatai at present.

The girl who was too well-behaved and too beautiful even to her.

"Kaihara-san......"

After marriage, Photon is really hard to believe.

"At that time, all the information records were interrupted, and I was the only one who experienced the accident in a sober state from beginning to end. So what happened in the dossier was reproduced through my memory. However, there are other people's memories to back it up. ”

She asked Mitsuko to look at her hairpins after marriage.

"I didn't lie to you. Although it was finally confirmed that it was Tokiwadai's responsibility for the accident, Hoshikawa was actually a victim. However, in order to apologize, the Hoshikawa family gave this to us, the victims of the accident. Everyone's style is different, but there are some things in common. If you're not convinced, ask your classmates who wear these hairpins. ”

The words of the classmate of Che Ban dispelled the last suspicion after marriage.

Ranked third among the 200 capable players in Tokiwadai, second only to the two LV.5.

The feeling that Kaihara's classmate gave her was not the type with this kind of name at all. She behaved too softly, and even thought that her ability might not be too strong after marriage.

It turns out that she is such a good person?

"By the way, by the way, I guess Haiyuan won't take the initiative to tell you. Haihara, she's the granddaughter of our school president. How is it? Can't you see it, right? ”

Cuta smiled "hehe". That look was clearly like feeling that it was a very proud thing to have such a classmate.

"Wait a minute, aren't you upset?"

"Not happy? Why? ”

"You're a victim of that accident, aren't you?"

"If you want to talk about the victims, in fact, everyone is, including Hoshikawa and Kaihara. Even Tokiwadai is innocent even strictly speaking. It was an unexpected coincidence. However, there are a few that are not fast. ”

“？”

"You see, if I could have been stronger, maybe there would have been a lot fewer victims."

After marriage, he moved his lips and finally didn't say anything.

Cheban's classmate actually looked at this problem from this angle, which was completely beyond her imagination.

By the way, this is the famous Tokiwadai Middle School, and the students of the school have the character and strength to live up to their name, and it is the form of their ideal prestigious school. Isn't that why you decided to transfer schools?

After being invited to the appointment, Photon actually felt a little restrained. I've met so many times before, but I don't know why, and I feel a little restrained after learning what kind of person she is.

The Tokiwadai Library building is divided into two circles, the inner circle is a traditional library in the formal European style, and the outer circle is a digital library composed of many small compartments. The inner ring needs to be absolutely quiet just like a regular library because it has an open inner design, while the outer ring does not have this requirement because the sound insulation of the cubicle is very good.

In fact, the rooms in the outer ring are dedicated to groups. Generally speaking, it is a place for students from various factions to study and discuss topics while researching materials. Tokiwadai has an independent platform for teachers, but sometimes teachers with retro habits come to the library to research and discuss topics.

"No. 6 ...... Room 6 ......" (Uploaded by: It's this spiritual number again!) ）

I had come to the library two days ago to familiarize myself with the school, but I really didn't care too much about the location.

"Ah, here?"

It took longer than expected, and after the marriage, Photon finally found the destination of the trip.

"It's rude."

Walking into the cubicle, as he thought, Kaihara-san was in it. However, unexpectedly, even Hoshikawa-san was there.

After learning a few things from Kiriban-san, Mitsuko was able to realize what kind of position the combination of these two people was in Tokiwadai after marriage.

"Ah, it's finally here, classmate."

"Good afternoon, Kaihara-san. Excuse me...... Can I help you? ”

"It's not a student meeting, so you don't have to be so formal." Completely unaware that he was the reason for his restraint after marriage, Dome Chu Chu stood up gracefully. "Coffee, or tea?"

The compartment in the outer ring is the terminal of the e-library, and students are not prohibited from carrying tea. Even since the student body often discusses topics in it, there is an automatic brewing machine that can serve black tea and coffee. Supposedly, to emulate the fashion of 19th-century European academia?

"Coffee."

"Well, please wait a minute. After marriage, you can take a look at the computer during this time, I have compiled some things that may be useful to you......"

"Wait a minute." Hoshikawa interjected, "I'll do it." Commentary, I can't do it. ”

Probably because of the sequelae of the ability to run out of power (I had already heard about it from Madara Mei after marriage), Hoshikawa's words still have a sense of lack of coherence.

"Well, I'm sorry for you. Then after marriage, please sit down. ”

Haiyuan pulled a chair from the side and motioned for the wedding to come over.

What's going on? After marriage, Mitsuko was a little confused.

What is it like to be called to the library by a classmate after school, as if to explain something to yourself?

After the wedding, he sat down beside Haiyuan and looked at the position pointed by the other party's white fingers.

As soon as I saw the model displayed on the computer, the photon was confused after marriage.

"What is this?"

"It's an LGA model, and it's a little bit designed, and it's going well."

“LGA？”

“Lattice_Gas_Automata。 Chaotic dynamics - fluid molecular motion, cellular automata-lattice gas automaton model. ”

What's that? After marriage, Mitsuko didn't understand it at all.

"To put it simply, it's a mathematical model. For example, the computer we use – the Turing machine – is a mathematical model of a discrete digital dynamic system. It's as simple as 'move one square left', 'move one square right', 'write down or clear a symbol', and 'conditional shift'. As a result, this is what we use today. And, that too. ”

Umihara pointed to the sky. Obviously, she was referring to the most advanced computer in the school city, the "tree designer" who was floating in a synchronous orbit.

Is there any connection between this, though?

"When you understand what a Turing machine is and what it is, it feels like watching the universe and then returning to Earth, which is too big and terrifying. The cellular automaton itself is a dynamic system that is discrete in time, space, and state, and is not determined by strict physical equations or functions, but is composed of a set of rules constructed by a set of models. Each cell in the grid takes a finite discrete state, and the cell forms the evolution of a dynamic system through simple interactions, and follows the same rules of action, and is updated synchronously according to the determined local rules. Of course, cellular automata is a very large field, and what we are talking about here is only one of them. The present model, which is a model of its branch, the lattice gas automata, is the product of the practical concretization of cellular automata in the fields of fluid mechanics and statistical physics. It differs from our traditional computational fluid dynamics numerical discretization method based on the description of the fluid continuum, and uses the dynamic characteristics of cellular automata to describe the fluid. This model is mainly used to describe gas flow. That is, the wind. ”

"Wind ......"

After getting married, Mitsuko finally understood what she said. But this result was somewhat unexpected.

In the process of her simple explanation, she was unconsciously attracted by the model transformed on the computer. As an aeromaker, the model in front of him clearly has a fatal attraction. It may not be an exaggeration to say that it has opened a whole new door.

"Well, married classmates. Wind is modeled not by deterministic and rigorous equations, but by mathematical models. Do you have any experience with such things? ”

"No, no. Maybe...... No, no, no! After coming back to his senses, he quickly shook his head. That was not what I meant! Could it be that you did all this for me? ”

"Hmm." Dome nodded slightly, as if completely inadvertently. "However, I am not alone, my brother has also helped a lot."

"No, I'm not asking that. None of this is easy, is it? Why do you want to do it to such an extent for me? ”

That's right, this is what Photon is most confused about after marriage. The model on the screen, at a glance, you know that it is very complicated. She has only known Haiyuan for a few days, and she completed this model in these few days. Putting that aside, why would she do so much for someone she'd only known for a few days?

"Why?" Umihara seemed to be confused, "Because, we're friends, right?" ”

The answer was a matter of course, but the feeling of finally grasping something resurfaced.

"And I'm a little selfish. I always felt that it would be nice to have someone to fly with me. So when I noticed it, I was already doing it unconsciously...... This ......"

Umihara shyly curled his fingers at the ends of his hair, as if it was an embarrassing thing to do.

In fact, it was really embarrassing for her. Because, don't you think it's a bit like inviting a dance partner to dance with?

(Okay...... It's so cute...... ）

After the marriage, Mitsuko stiffened on the spot.

It is very rare for Haiyuan, who has always behaved very calmly and elegantly, to show such a shy appearance like a little girl, not only did the photon freeze after marriage, but even Xingchuan, who was serving coffee, almost let the coffee cup fall off.

It's so cute.

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Uploader's note: I honestly find it a bit difficult to describe the cellular automata. The cellular automata was first proposed by Johann von Neumann, but in fact, the concept was developed very early. Of course, that's not our focus here. The point is that this evolution is "automatic". In principle, it is defined as a large number of individual lattices which, when they evolve according to common rules, interact to form the evolution of a dynamic system. The point here is that the state of each grid can be different, but it can only be in one state at a time. As time changes, the lattice will change state according to the same rules as the neighboring tiles. In other words, the state of any grid is determined by the state of the surrounding cells at the previous moment. In this way, we can understand why it can shine in the field of fluid mechanics in physics.

Cellular automata is a concept that transcends a single discipline and is used not only in physics, but also in sociology, biology, informatics, chemistry, computer science, and other fields.

In the field of physics, it is used in system dynamics to describe the overall behavior of systems such as fractals, chaos, symmetry breakage, order, etc., and provides a valuable mathematical model for systems engineering and chaotic dynamics.